Qt vulnerabilities: known CVEs & security history
The Qt Company · Dev / Framework · 5 tracked CVEs · 0 actively exploited · updated November 2026 · what is a CVE? →
This is the full list of known vulnerabilities (CVEs) across all Qt release lines — 5 in total. A CVE here doesn't mean your version is affected — check Qt's current status and the safe version to run.
Known Qt CVEs
Actively-exploited and most-severe first. Open any CVE for full details.
| CVE | Severity | CVSS | EPSS | Year |
|---|---|---|---|---|
| CVE-2023-51714 | critical | 9.8 | 1% | 2023 |
| CVE-2020-24742 | high | 7.8 | 1% | 2021 |
| CVE-2021-38593 | high | 7.5 | 3% | 2021 |
| CVE-2020-0570 | high | 7.3 | 1% | 2020 |
| CVE-2025-5683 | medium | 5.5 | 0% | 2025 |
Is my Qt version affected?
The list above spans every release. To know whether your version is affected — and the minimum safe version to upgrade to — check it directly.
Check your Qt version → · Monitor Qt for new CVEs →
Qt vulnerabilities — frequently asked
How many known vulnerabilities does Qt have?
IsItPatched tracks 5 CVEs for Qt. 1 is critical-severity and 3 high-severity. These span every release line — what matters is whether the version you run is affected.
Does Qt have any actively-exploited vulnerabilities?
None of Qt's tracked CVEs are currently in CISA's KEV catalog — but new ones can be added at any time, so keep your version current.
What is the most severe Qt vulnerability?
Among tracked issues, CVE-2023-51714 (CRITICAL, CVSS 9.8) ranks highest — a Integer overflow weakness.
Is Qt safe to use?
It depends on the version. The latest supported Qt release (6.12.0) clears the known issues; older versions may still be affected. Check the exact version you run for a verdict.
CVE data aggregated from NVD, CISA KEV and EPSS (FIRST.org). Related: Qt security status · Qt end-of-life · actively-exploited CVEs. Always verify against The Qt Company's advisories — see our disclaimer.